Backing roll for sheet or pack rolling mills



May 12, 1936. PATERSQN 2,040,400

BACKING ROLL FOR SHEET OR PACK ROLLING MILLS Filed Feb. 6, 1933 L j INVENTOR U1 nefariQzfirsonv v F A M aw I 5 v a ATTORNEYS Patented May 12, 1936 UNITED STATES BACKING ROLL FOR SHEET OR PACK ROLLING MILLS Alexander Paterson, Bufialo, N. Y.

Application February 6, 1933, Serial No. 655,417

11 Claims.

This invention relates to mills for use in connection with sheet and tin plate rolling and. more particularly the invention is concerned with improvements in backing rolls therefor of the kind disclosed in my co-pending application, Ser. No.

582,208, filed December 21, 1931.

In the rolling of sheet metal the working rolls, i. .e., the rolls which provide the reducing pass, are deflected at their centers owing to the bending stresses set up during each reduction. As the magnitude of the reductions decreases, the magnitude of the deflections decreases correspondingly. The sheet or pack, therefore, approaches a flat or rectangular .form as its thickness is --reduced. Heretofore, it has been the practice to employ backing rolls in .connection with the working rolls, the former cooperating with the latter to maintain the deflection of the working rolls at a minimum in order to adhere as closely as possible to ideal rolling conditions.

It is essential to good rolling conditions that the sheet or pack fit the pass provided by the working rolls. My copending application, above referred to, covers a mill characterized by a work-' ing pass, which with respect to a particular screw adjustment, may be varied without the necessity Of replacing any of the parts of the mill. To this end the backing rolls are formed .to provide spaced zones for local contact with the working rolls and the pass provided by the latter is controlled by varying relatively the diameter of the backing rolls at said zones. Such variations may be effected by the use of suitable. heating and cooling equipment, the said equipment being adapted to cause the backing rolljto expand or contract at said zones to the extent which may be necessary toregulate the deflection of the working rolls. The heating and cooling equipment-may, for example, consist of a saddle'which 4 is arranged in contacting relation or in close proximity to each of the contact zones, the said saddle being maintained at the desired temperature by a suitable medium such as steam, hot water, oil, molten metal, et cetera.

45 The principal object of the present invention is to provide a backing roll of-the kind generally described in which those portions of the roll which provide the contact zones are-so formed that the resistance which the roll offers to expansion and 5 contraction at said zones is minimized, whereby to increase the sensitivity of the roll to the influence of the heating and cooling equipment.

The invention is illustrated in the accompanying drawing, in which:

Figure 1 is a front elevation of a two-high mill in which features of the invention are incorporated.

Figure 2 is an enlarged section taken along line 2--2 of Fig. 1. v

Figure 3 is a view similar to Fig. 1 showing the 5 use of one of the backing rolls in connection with each of the working rolls of the mill.

Figured is a front elevation of a two-high mill in which intermediate rolls are arranged be- I tween the backing and the working rolls. 10

The backing roll is illustrated, by way of example, in connection with various types of twohigh mills. It is to be understood, however, that the advantages of the, invention may also be obtained by the use of the roll in connection with 15 the working rolls of various kinds of multi-pass mills.

The backing roll which is indicated generally at 5 is illustrated in Figure 1 in connection with a mill which includes upper and lower working 20 rolls 6 and 1 respectively, the said backing roll cooperating with the lower of the workingrolls. The various rolls are mounted in suitable housings 8, each of which is provided with a conventional adjusting screw 9 by which the magnitude 25 of the reductions is controlled. The backing roll, as illustrated, is formed or'provided with end collars It and an intermediate collar H, the latter preferably being of a suitably smaller diameter than the former. The collars provide zones 30 for localcontact with the lower working roll to limit the deflection of the latter during the reducing pass, the relative diameters of the col' lars determining the extent to which the lower roll is deflected, whereby the sheet or pack will be formed with a predeterminedcross-sectional convexity.

The pressure exercised by the backing roll upon the associated working roll, and hence the degree of deflection of the working roll, depends among other factors upon the relative diameters of the backing roll at the points" of contact with the working'roll, and this factor remains constant as the temperature remains constant. It will be understood that by relatively increasing or decreasing the diameter of the intermediate section of the backing roll, i. e. in the preferred construction the diameter of the intermediate collar whereby it will be of a diameter relatively greater or relatively'less than the diameters of the end' collars, the deflection of the working roll will be controlled with reference to the cross-section of the sheet or pack. The variations in the relative diameters of the collars will for most purposes be' of the order of a few thousandths, i. e. up to ten ortwelve'thousandths, of an inch and such or other variations as circumstances may require may,vtherefore, be readily obtained by the use of suitable heating and cooling equipment.

In accordance with the invention the backing 7 roll is so formed as to minimize the resistance which it offers to expansion and contraction of the portions thereof which provide the zones for V a local contact with the Working roll. To this end the central collar 11 of the backing-"rollis' prb vided with grooves 12' which are formed inany suitable manner.

division of the collar II in the manner described enables relative movement between thvarious sections of the vcontact zonethereby eliminating;

to a'large degree the constraining effect which would otherwise be present if the sectiOnalcOn' weeten we e. 9 emp q al- Du ingz e e 9r cooling of the collar II the sections thereoi eg: pand; or contract; as the case may be, the grooves I'2 narrowing and widening as the;f said s tions m r w d and-a a r m we anti et- ,iThe grooves l2 are preferably arranged'spir M 1y or obliquelyin order to insure; quiet operat on he P v nt e i-f k n 10 re ifi or dthrwiser i n the 'wprki te The width of the groovesis the: minimum ermitted by the grooveformingoperation and the f 'i t o the b l ich n en-t1 q xceeds theflwidth is suitable 'for the,purposes in vie w,

5 having in mind the work for which-the rmll ,;is

designed: {They-collars 10 in addition-tethe col: ahug 1 ay also be clividedfin the manner de: scribed or; if desired, the backing roll maxi-be formed to contact with the -worki n g roll throughoutIjits entire length, the grooves in such, case extending thefull lengthjo fl theroll. i'lh e perip11? ral segments or sections delimited by thelgrooves l3; will be of the same extent.-- The vrapidity and s'ensitiveness of the adjustment will increase with thefnumber of I segments; thel miiiimuni number o ffls gments .consistentlwith -the requirements is p ferab ewr nethe embodiment of the nventio nias illus V in Figure 3a backing roll i i is employed in connection with eachgof: the working qrolls .13

n 1443f, the milljthesaid backingflrolls being sinnlafito j and" functioning in substantia y the ranged between theworking roll-| 5 and the upper 'hp eh and lower working, rolls:

ih i sian i H tandem??- spectively .A, backing roll ll which is sirnilar .to

The said grooves divide the collar into a plurality of complementary segments or sections, each of which provides arrindepend ent area for contact with the working rollf fl lfie of 5 the mill.

r 2,.Thecombination with the working roll of a 'mill:of the cliaracter described, of a backing roll 'which is -provided with a zone for local contact with the workingmoll, whereby by suitably heatr" ulated as desired. Backing rolls embodying the invention may be of any alloy or composition.

suitable for the work in view.

I claim as my invention: 7 p 1. The combination'with the working roll of a mill of the character described,'of a backing roll which is provided with a zone for local contact with the working roll, whereby by suitably heating and cooling the backing roll at said zone the diariitefoifili backing rollat said zone may bevaried "to" control the deflection of the said working roll, said zone being divided by grooves into a plurality of complementary segments each of which provides an area for contact with the Workingr'ollfwhereby to facilitate the control of thep'ass which is provided by the working rolls backing roll at said zone the th backingroll shown in Figure 1 is employed V in connection with each of the working rolls .v'In

this embodiment an intermediate roll El 8, is; are,

roll and asimilarroll :l is arranged be? tweenj t he working roll IS and the lower backing roll; I-ressure: from the working r olls istrans nritted to 'the backing rolls fth roughrthe agency;

Ofgthq intermediate; rolls, Scoring 101 marring;

therefore; of. the working rolls by the backing Q S izP v d-.- t q l g i Fromthe v foregoing it will-beapparent that, by forming the contact zones of the-backingiroll F in the manner described the said zonesare rendered more sensitive "to the heating and cooling, equipment which is employed in connection with the mill. Hence the diameter of the IOHAat thQ contac zones can be. rapidlyand sensitively-regL-ito facilitate the control of the pass which is provided by the working rolls of the mill.

6. The combination with the working roll of a mill of the character described, of a backing roll which is formed with end and intermediate collars which are adapted to provide zones for local contact with the working roll, whereby by suitably heating and cooling the backing roll at said collars the diameter of the backing roll at said collar may be varied to control the deflection of the said working roll, said intermediate collar being divided by grooves into a plurality of complementary segments each of which provides an area for contact with the working roll, whereby to facilitate the control of the pass which is provided by the working rolls of the mill.

7. The combination with the working roll of a mill of the character described, of a backing roll which is formed with end and intermediate collars which are adapted to provide zones for local contact with the working roll, whereby by suitably heating and cooling the backing roll at said collars the diameter of the backing roll at said collars may be varied to control the deflection of the said working roll, said intermediate collar being grooved to provide a. plurality of complementary segments each of which is adapted to provide an area for contact with the working roll, whereby to facilitate the control of the pass which is provided by the working rolls of the mill.

8. An integral backing roll for limiting to a predetermined degree the deflection of a working roll of a sheet or pack rolling mill, said backing roll being grooved to divide its periphery into segments, whereby to increase the sensitivity of.

the said backing roll to changes in temperature and facilitate control of its contour substantially as and for the purpose set forth.

9. An integral backing roll for limiting to a predetermined degree the deflection of a working roll of a sheet or pack rolling mill, said backing roll being grooved along spiral or oblique lines to divide its periphery into segments, whereby to increase the sensitivity of the said backing roll to changes in temperature and facilitate control of its contour substantially as and for the purpose set forth. 7

10. An integral backing roll for a sheet or pack rolling mill having one or more contact collars, said collars being grooved so that they are peripherally segmented, substantially as and for the purpose set forth. 7

11. An integral backing roll for a sheet or pack rolling mill having one or more contact collars,

said collars being grooved so that they are pe--v ripherally segmented along spiral or oblique lines, substantially as and for the purpose set forth.

ALEXANDER PATERSON. 

